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A lithium-ion battery composite material and preparation method thereof, and positive electrode material comprising the composite material

A technology for lithium ion batteries and composite materials, applied in the fields of lithium ion battery composite materials, positive electrode materials and batteries, can solve the problems of low charge and discharge capacity, low discharge depth, etc., to solve the problem of manganese dissolution, reduce manganese dissolution, and improve discharge Effect of depth and charge-discharge capacity

Active Publication Date: 2019-04-19
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the description of the method, the manganese in the lithium manganese iron phosphate with the core-shell structure is in the core layer, which avoids its direct contact with the electrolyte and causes its dissolution, and solves the problem of manganese dissolution, but the material with this structure still has a low discharge depth. , The problem of low charge and discharge capacity

Method used

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  • A lithium-ion battery composite material and preparation method thereof, and positive electrode material comprising the composite material

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preparation example Construction

[0022] The present application also proposes a method for preparing a lithium-ion battery composite material, including:

[0023] (1) Mix the lithium source, the phosphorus source and the iron source according to the metering ratio, and react to obtain the precursor A, the reaction temperature is 105~130°C, and the reaction time is 1~30min;

[0024] (2) Mix the lithium source, phosphorus source, iron source, and manganese source according to the metering ratio, and react with the precursor A to obtain the precursor B, the reaction temperature is 105~120 ℃, and the reaction time is 1~30min;

[0025] (3) the lithium source, the phosphorus source, the iron source and the precursor B are mixed and reacted, and the reaction product is washed and dried to obtain a composite material in which the inner core is lithium iron phosphate, the outer core is lithium manganese iron phosphate, and the shell layer is lithium iron phosphate, Wherein the reaction temperature is 160~220°C, and th...

Embodiment 1- Embodiment 5

[0035] Example 1-Example 5: Preparation of lithium-ion battery composite material.

Embodiment 1

[0037] (1) Under nitrogen protection, the preparation concentration is 0.25mol / L ferrous sulfate solution, and the concentration is 0.5mol / L phosphoric acid solution, then the phosphoric acid solution is added to the ferrous sulfate solution to form a mixed solution, and then 5g ascorbic acid is added to form Mix solution E1. Under nitrogen protection, a lithium hydroxide F1 solution with a concentration of 0.750 mol / L was prepared. The lithium hydroxide solution F1 is added to the mixed solution E1 under stirring, and mixed with an emulsifier during the mixing process to obtain a precursor A containing phosphorus, iron and lithium, where Li:Fe:P=3:0.98:1.

[0038] (2) Under nitrogen protection, weigh 2335.32g of ferrous sulfate and 2637.02g of manganese sulfate and add deionized water to prepare a mixed solution. In addition, the concentration of the preparation is 2.4mol / L phosphoric acid solution, and then the phosphoric acid solution is added to the ferrous sulfate solutio...

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Abstract

The invention provides a lithium ion battery composite material and a preparation method thereof, and a positive electrode material including the composite material; the composite material includes lithium iron phosphate and at least 2 layers of shell bodies coating the surface of the lithium iron phosphate; the first layer of shell body is lithium manganese iron phosphate, and the second layer of shell body is lithium iron phosphate. The invention also provides the lithium ion battery positive electrode material including the lithium ion battery composite material, a conductive agent and a binder. The lithium ion battery composite material provided by the invention can obviously improve the discharge depth of the battery and the discharge capacity of the battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery composite material, a positive electrode material comprising the composite material, and a battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and good safety performance. LiMnPO is used as a positive electrode active material for lithium-ion batteries. 4 With LiFePO 4 Similar structure, the same theoretical capacity, but its discharge plateau voltage is the same as that of LiFePO 4 Compared with the larger improvement, so the energy density has a larger improvement. But with LiFePO 4 Compared to LiMnPO 4 The electrical conductivity of LiMnPO is poor and is affected by the Jahn-Teller effect during charging and discharging. 4 The depth of discharge is low, the actual capacity is low, and the rate performance and cycle performance are also poor. In addition, in the proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/136
CPCY02E60/10
Inventor 蔡志炬曹文玉肖峰
Owner BYD CO LTD
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